# CVE-2026-46654

## Summary

- **CVE ID:** CVE-2026-46654
- **Severity:** HIGH
- **CVSS Score:** 8.9 (CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N)
- **CWE:** CWE-1240, CWE-345
- **Published:** Jun 10, 2026
- **Last Modified:** Jun 11, 2026

## Description

Plonky3 is a toolkit for polynomial IOPs (PIOPs). Prior to versions 0.4.3 and 0.5.3, an attacker controlling prover-side observations can craft distinct transcripts that produce identical challenges, breaking the binding property of Fiat-Shamir. This issue has been patched in versions 0.4.3 and 0.5.3.

## Affected Products

- Plonky3 — Plonky3 (< 0.4.3)
- Plonky3 — Plonky3 (>= 0.5.0, < 0.5.3)

## References

- [CNA](https://github.com/Plonky3/Plonky3/security/advisories/GHSA-vj64-rjf3-w3v7)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.11%
- **EPSS Percentile:** 1.3

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._